RAID slice or spare?

I'm have a mirrored RAID set. Both drives are setup as a RAID slice. My RAID is working great. Now I would like to add a drive to the RAID that I could take off site. I would like to plug in the 3 drive and have it update. Then when it's done take it off site for a week then bring it back and have it update again. So I've added the 3rd drive to the set. I just don't know if I should make the 3rd drive a RAID slice or a spare. I also already have "RAID mirror autoRebuild" on. Which one will let me eject one of the drive and have the RAID continue with the other 2 drives?
Thanks for any help on this.
  Mac OS X (10.4.7)  

If no one knows the answer mybe a good web site that I might find the info.
Thanks

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    Message was edited by: rowby

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